Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A sensor of an electromagnetic induction type coordinate input device, comprising: a first loop coil group, in which plural first loop coils are disposed in a first direction, each of the first loop coils including a first extraction line portion composed of a first line and a second line formed in parallel with each other, and a first loop portion continuously connected to the first and second lines of the first extraction line portion and having a shape that surrounds a predetermined area; and a second loop coil group, in which plural second loop coils are disposed in a second direction perpendicular to the first direction, each of the second loop coils including a second extraction line portion composed of a third line and a fourth line formed in parallel with each other, and a second loop portion continuously connected to the third and fourth lines of the second extraction line portion and having a shape that surrounds a predetermined area, wherein an area occupied by the first loop portions of the first loop coil group and the second loop portions of the second loop coil group define a position detection area, and wherein one of the first line or the second line of one of the first loop coils is connected to at least one of: (i) the first line or the second line of another one of the first loop coils, and (ii) a line of the second loop portion of one of the second loop coils, within the position detection area, to form a common extraction line with (i) and/or (ii), and the other of the first line or the second line of said one of the first loop coils having the common extraction line is disposed in parallel with and close to the common extraction line.
An electromagnetic induction coordinate input device (like a drawing tablet) has two sets of wire loops on a substrate that define a position detection area. One set of loops (first loop coil group) runs in a first direction, and the other set (second loop coil group) runs perpendicular to it. Each loop has an extraction line consisting of two parallel wires. To reduce the number of wires, one of the wires of one loop coil is connected to either a wire of another loop coil in the same group or to a wire of a loop in the other group. This connection happens inside the position detection area, creating a shared wire. The remaining wire of the loop coil having the shared wire runs parallel and close to the shared wire.
2. The sensor of an electromagnetic induction type coordinate input device according to claim 1 , wherein the first line of the first extraction line portion is a line through which a signal is supplied or a signal is taken out, and the second line of the first extraction line portion is a line which is connected to a reference electric potential; and the second line of the first extraction line portion of said one of the first loop coils is connected to at least one of: (i) the second line of the first extraction line portion of another one of the first loop coils, and (ii) a line of the second loop portion of one of the second loop coils, to form a common extraction line with (i) and/or (ii), and the first line of said one of the first loop coils having the common extraction line is disposed in parallel with and close to the common extraction line.
This invention relates to an electromagnetic induction type coordinate input device, specifically addressing signal extraction and noise reduction in loop coil configurations. The device includes first and second loop coils arranged to detect coordinate input. The first loop coils have a first extraction line portion with two lines: one for signal supply or output and another connected to a reference electric potential. To minimize noise and improve signal integrity, the second line of one first loop coil is connected to either the second line of another first loop coil or a line of a second loop coil, forming a common extraction line. The first line of the first loop coil sharing this common extraction line is positioned parallel and close to it, enhancing electromagnetic coupling and reducing interference. This configuration simplifies wiring while maintaining signal quality, addressing challenges in multi-coil electromagnetic input systems where noise and crosstalk degrade performance. The design ensures efficient signal extraction and stable operation in coordinate input applications.
3. The sensor of an electromagnetic induction type coordinate input device according to claim 1 , wherein at least a portion of the first loop portions of the first loop coils which extend to intersect with the first direction is formed on a first surface of a substrate, the first extraction line portions are formed on a second surface on a side opposite to the first surface of the substrate, and the first extraction line portions and the first loop portions are connected to each other via through holes provided in the substrate; and at least a portion of the second loop portions of the second loop coils which extend to intersect with the second direction is formed on the second surface of the substrate, and a connection between said one of the first line or the second line of one of the first loop coils and at least one of: (i) the first line or the second line of another one of the first loop coils and (ii) a line of the second loop portion of one of the second loop coils is formed on the second surface of the substrate.
This invention relates to an electromagnetic induction type coordinate input device, specifically addressing the challenge of efficiently routing signal lines in a multi-layered substrate to minimize interference and improve signal integrity. The device includes a substrate with conductive loop coils on both surfaces, where the first set of loop coils (first loop coils) are primarily formed on a first surface of the substrate, and their corresponding extraction lines are formed on the opposite (second) surface. These extraction lines are connected to the loop coils via through holes in the substrate. The second set of loop coils (second loop coils) are partially formed on the second surface, intersecting a different direction than the first loop coils. Connections between the first loop coils and either other first loop coils or second loop coils are also made on the second surface. This layered arrangement reduces signal crossover and interference, improving detection accuracy in coordinate input applications. The design optimizes space utilization and signal routing while maintaining reliable electromagnetic induction performance.
4. The sensor of an electromagnetic induction type coordinate input device according to claim 1 , wherein two or more second lines of the first extraction line portions of the two or more first loop coils of the first loop coil group are commonly connected to the second line of the first extraction line portion of another one of the first loop coils of the first loop coil group, within the position detection area, to form a common extraction line, and two or more first lines of the two or more first loop coils sharing the common extraction line are disposed in parallel with the common extraction line.
In the electromagnetic induction coordinate input device described in claim 1 (an electromagnetic induction coordinate input device including a first loop coil group, in which plural first loop coils are disposed in a first direction, each of the first loop coils including a first extraction line portion composed of a first line and a second line formed in parallel with each other, and a first loop portion continuously connected to the first and second lines of the first extraction line portion and having a shape that surrounds a predetermined area; and a second loop coil group, in which plural second loop coils are disposed in a second direction perpendicular to the first direction, each of the second loop coils including a second extraction line portion composed of a third line and a fourth line formed in parallel with each other, and a second loop portion continuously connected to the third and fourth lines of the second extraction line portion and having a shape that surrounds a predetermined area, wherein an area occupied by the first loop portions of the first loop coil group and the second loop portions of the second loop coil group define a position detection area, and wherein one of the first line or the second line of one of the first loop coils is connected to at least one of: (i) the first line or the second line of another one of the first loop coils, and (ii) a line of the second loop portion of one of the second loop coils, within the position detection area, to form a common extraction line with (i) and/or (ii), and the other of the first line or the second line of said one of the first loop coils having the common extraction line is disposed in parallel with and close to the common extraction line), multiple ground wires from different loops in the first loop set are connected to the ground wire of another loop in the same set, creating a shared ground. The signal wires of the loops that share the ground are placed parallel to the shared ground wire.
5. The sensor of an electromagnetic induction type coordinate input device according to claim 4 , wherein the two or more first lines of the first extraction line portions of the two or more first loop coils sharing the common extraction line, which are disposed in parallel with the common extraction line, are alternately arranged on both sides of the common extraction line with the common extraction line located at a center.
This invention relates to electromagnetic induction type coordinate input devices, specifically improving the design of loop coils used for detecting position coordinates. The problem addressed is optimizing the arrangement of extraction lines in multi-loop coil configurations to reduce interference and improve signal clarity. The device includes multiple loop coils, each with extraction line portions for transmitting signals. A common extraction line is shared by two or more first loop coils, with their first extraction line portions arranged parallel to the common line. The key improvement is the alternating arrangement of these first extraction line portions on both sides of the common extraction line, centered around it. This configuration minimizes electromagnetic interference between adjacent loops while maintaining efficient signal transmission. The loop coils are positioned such that their extraction line portions are symmetrically distributed around the common line, reducing crosstalk and improving positional accuracy. The alternating pattern ensures balanced signal distribution, enhancing detection performance. This design is particularly useful in touch-sensitive surfaces where precise coordinate tracking is required, such as in touchscreens or digitizers. The invention focuses on the structural arrangement of the extraction lines rather than the overall device operation, providing a solution for cleaner signal processing in multi-coil systems.
6. The sensor of an electromagnetic induction type coordinate input device according to claim 4 , wherein the plural first loop coils of the first loop coil group are divided into plural groups, and the second lines of the first extraction line portions of the first loop coils in each of the plural groups are made into a common extraction line.
This invention relates to electromagnetic induction type coordinate input devices, specifically improving the design of sensor coils to enhance signal extraction efficiency. The problem addressed is the complexity and signal interference in traditional loop coil arrangements, where multiple individual extraction lines can lead to cluttered wiring and reduced performance. The sensor includes a first loop coil group with multiple first loop coils, each having a first extraction line portion. These coils are divided into multiple subgroups, and within each subgroup, the second lines of the first extraction line portions are combined into a single common extraction line. This reduces the number of extraction lines needed, simplifying the sensor's wiring structure and minimizing signal interference. The first loop coils are arranged in a grid pattern, with each coil generating an electromagnetic field used to detect the position of a stylus or other input device. The common extraction line for each subgroup consolidates signals from multiple coils, improving signal-to-noise ratio and reducing manufacturing complexity. This design is particularly useful in high-resolution coordinate input devices, such as touchscreens or digitizers, where precise and reliable signal detection is critical. By grouping and sharing extraction lines, the invention optimizes both performance and manufacturability.
7. The sensor of an electromagnetic induction type coordinate input device according to claim 4 , wherein the two or more second lines of the first extraction line portions of the two or more first loop coils are connected to the second loop portion(s) of the second loop coil(s), within the position detection area, to commonly use line(s) of the second loop portion(s) as common extraction line(s), and the two or more first lines of the first extraction line portions of the two or more first loop coils are disposed in parallel with the common extraction line(s).
This invention relates to electromagnetic induction type coordinate input devices, specifically improving the design of loop coils used for position detection. The problem addressed is the complexity and inefficiency in wiring and signal extraction from multiple loop coils in such devices. Traditional designs require separate extraction lines for each loop coil, leading to increased wiring complexity and potential signal interference. The invention provides a sensor with first and second loop coils arranged within a position detection area. The first loop coils each have a first extraction line portion with two or more lines, while the second loop coils have second loop portions. The key improvement is that the second lines of the first extraction line portions from multiple first loop coils are connected to the second loop portions of the second loop coils, allowing shared use of these lines as common extraction lines. Additionally, the first lines of the first extraction line portions are arranged in parallel with these common extraction lines. This design reduces the number of required extraction lines, simplifies wiring, and minimizes signal interference by consolidating connections. The parallel arrangement further optimizes space and signal routing efficiency within the device. The invention enhances the practicality and performance of electromagnetic induction coordinate input systems by streamlining the electrical connections between loop coils.
8. The sensor of an electromagnetic induction type coordinate input device according to claim 1 , wherein the plural first loop coils of the first loop coil group overlap one another, and the plural second loop coils of the second loop coil group overlap one another.
In the electromagnetic induction coordinate input device described in claim 1 (an electromagnetic induction coordinate input device including a first loop coil group, in which plural first loop coils are disposed in a first direction, each of the first loop coils including a first extraction line portion composed of a first line and a second line formed in parallel with each other, and a first loop portion continuously connected to the first and second lines of the first extraction line portion and having a shape that surrounds a predetermined area; and a second loop coil group, in which plural second loop coils are disposed in a second direction perpendicular to the first direction, each of the second loop coils including a second extraction line portion composed of a third line and a fourth line formed in parallel with each other, and a second loop portion continuously connected to the third and fourth lines of the second extraction line portion and having a shape that surrounds a predetermined area, wherein an area occupied by the first loop portions of the first loop coil group and the second loop portions of the second loop coil group define a position detection area, and wherein one of the first line or the second line of one of the first loop coils is connected to at least one of: (i) the first line or the second line of another one of the first loop coils, and (ii) a line of the second loop portion of one of the second loop coils, within the position detection area, to form a common extraction line with (i) and/or (ii), and the other of the first line or the second line of said one of the first loop coils having the common extraction line is disposed in parallel with and close to the common extraction line), the loops of the first set (running in the first direction) overlap each other, and the loops of the second set (running in the second direction) also overlap each other.
9. The sensor of an electromagnetic induction type coordinate input device according to claim 1 , wherein the first extraction line portions and the second extraction line portions are both disposed in parallel with the first direction and are both connected to one connector portion.
In the electromagnetic induction coordinate input device described in claim 1 (an electromagnetic induction coordinate input device including a first loop coil group, in which plural first loop coils are disposed in a first direction, each of the first loop coils including a first extraction line portion composed of a first line and a second line formed in parallel with each other, and a first loop portion continuously connected to the first and second lines of the first extraction line portion and having a shape that surrounds a predetermined area; and a second loop coil group, in which plural second loop coils are disposed in a second direction perpendicular to the first direction, each of the second loop coils including a second extraction line portion composed of a third line and a fourth line formed in parallel with each other, and a second loop portion continuously connected to the third and fourth lines of the second extraction line portion and having a shape that surrounds a predetermined area, wherein an area occupied by the first loop portions of the first loop coil group and the second loop portions of the second loop coil group define a position detection area, and wherein one of the first line or the second line of one of the first loop coils is connected to at least one of: (i) the first line or the second line of another one of the first loop coils, and (ii) a line of the second loop portion of one of the second loop coils, within the position detection area, to form a common extraction line with (i) and/or (ii), and the other of the first line or the second line of said one of the first loop coils having the common extraction line is disposed in parallel with and close to the common extraction line), the extraction lines of both loop sets (running in the first and second directions) are parallel to the first direction and are connected to a single connector.
Unknown
October 14, 2014
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.